<template>
  <div class="cart">
    <h4>全部商品</h4>
    <div class="cart-main">
      <div class="cart-th">
        <div class="cart-th1">全部</div>
        <div class="cart-th2">商品</div>
        <div class="cart-th3">单价（元）</div>
        <div class="cart-th4">数量</div>
        <div class="cart-th5">小计（元）</div>
        <div class="cart-th6">操作</div>
      </div>
      <div class="cart-body">
        <ul class="cart-list" v-for="cart in carInfoList" :key="cart.id">
          <li class="cart-list-con1">
            <input type="checkbox" name="chk_list" :checked="cart.isChecked == 1" @change="updateChecked(cart, $event)">
          </li>
          <li class="cart-list-con2">
            <img :src="cart.imgUrl">
            <div class="item-msg">{{ cart.skuName }}</div>
          </li>
          <li class="cart-list-con4">
            <span class="price">{{ cart.cartPrice }}.00</span>
          </li>
          <li class="cart-list-con5">
            <a href="javascript:void(0)" class="mins" @click="handler('minus', -1, cart)">-</a>
            <input autocomplete="off" type="text" minnum="1" class="itxt" :value="cart.skuNum"
              @change="handler('change', $event.target.value * 1, cart)">
            <a href="javascript:void(0)" class="plus" @click="handler('add', 1, cart)">+</a>
          </li>
          <li class="cart-list-con6">
            <span class="sum">{{ cart.skuNum * cart.cartPrice }}</span>
          </li>
          <li class="cart-list-con7">
            <a class="sindelet" @click="deleteCartById(cart)">删除</a>
            <br>
            <a href="#none">移到收藏</a>
          </li>
        </ul>
      </div>
    </div>
    <div class="cart-tool">
      <div class="select-all">
        <input class="chooseAll" type="checkbox" :checked="isAllCheck&&carInfoList.length>0" @change="updateAllCartChecked">
        <span>全选</span>
      </div>
      <div class="option">
        <a @click="deleteAllCheckedCart">删除选中的商品</a>
        <a href="#none">移到我的关注</a>
        <a href="#none">清除下柜商品</a>
      </div>
      <div class="money-box">
        <div class="chosed">已选择
          <span>0</span>件商品
        </div>
        <div class="sumprice">
          <em>总价（不含运费） ：</em>
          <i class="summoney">{{ totalPrice }}</i>
        </div>
        <div class="sumbtn">
          <a class="sum-btn" @click="toTrade">结算</a>
        </div>
      </div>
    </div>
  </div>
</template>

<script>
import { mapGetters } from 'vuex'
import throttle from "lodash/throttle";

export default {
  name: 'ShopCart',

  mounted() {
    this.getData()
  },

  methods: {
    // 获取个人购物车
    getData() {
      this.$store.dispatch('shopCar/getCarList')
    },

    //加入节流操作
    handler: throttle(async function (type, disNum, cart) {
      //type:为了区分这三个元素
      //disNum形参:+ 变化量（1）  -变化量（-1）   input最终的个数（并不是变化量）
      //cart:哪一个产品【身上有id】
      //向服务器发请求，修改数量

      //减按钮判断当前数量是否为1
      if (type === 'minus') {
        //当商品数量为1是，不可以再减少
        if (cart.skuNum === 1) {
          return;
        }
      }
      //输入框修改,难点：要判断输入的内容是否合法
      if (type === 'change') {
        //输入内容不合法时
        if (isNaN(disNum * 1) || disNum <= 0) {
          disNum = 0;
        } else {
          disNum = parseInt(disNum) - cart.skuNum
        }
      }
      //加按钮disNum不需要改变
      try {
        await this.$store.dispatch('detail/addOrUpdateShopCar', { skuId: cart.skuId, skuNumber: disNum })
        //商品数量修改成功后再次获取服务器数据
        await this.$store.dispatch("shopCar/getCarList")

      } catch (error) {
        alert(error)
      }
    }, 100),

    //删除某一个产品的操作
    async deleteCartById(cart) {
      try {
        //如果删除成功再次发请求获取新的数据进行展示
        await this.$store.dispatch("shopCar/deleteCartListBySkuId", cart.skuId);
        this.getData();
      } catch (error) {
        alert(error.message);
      }
    },

    //修改某个产品的勾选状态
    async updateChecked(cart, event) {
      //带给服务器的参数isChecked，不是布尔值，应该是0|1
      try {
        //如果修改数据成功，再次获取服务器数据（购物车）
        let isChecked = event.target.checked ? "1" : "0";
        await this.$store.dispatch("shopCar/updateCheckedById", {
          skuId: cart.skuId,
          isChecked,
        });
        this.getData();
      } catch (error) {
        //如果失败提示
        alert(error.message);
      }
    },

    //修改全部产品的选中状态
    async updateAllCartChecked(event) {
      try {
        let isChecked = event.target.checked ? "1" : "0";
        //派发action
        await this.$store.dispatch("shopCar/updateAllCartIsChecked", isChecked);
        this.getData();
      } catch (error) {
        alert(error.message);
      }
    },

    //删除全部选中的产品
    //这个回调函数咱门没办法收集到一些有用数据
    async deleteAllCheckedCart() {
      try {
        //派发一个action
        await this.$store.dispatch("shopCar/deleteAllCheckedCart");
        //再发请求获取购物车列表
        this.getData();
      } catch (error) {
        alert(error.message);
      }
    },

    // 跳转路由
    toTrade(){
        this.$route.meta.flag = true
        this.$router.push('/trade')
      }


  },

  computed: {
    ...mapGetters('shopCar', ['carList']),
    // 购物车数据
    carInfoList() {
      return this.carList.cartInfoList || []
    },
    // 计算总价
    totalPrice() {
      let sum = 0
      this.carInfoList.forEach(item => {
        if (item.isChecked === 1) {
          sum += item.skuNum * item.cartPrice
        }
      })
      return sum
    },
    //判断底部勾选框是否全部勾选
    isAllCheck() {
      //every遍历某个数组，判断数组中的元素是否满足表达式，全部为满足返回true，否则返回false
      return this.carInfoList.every(item => item.isChecked === 1)
    }

  }
}
</script>

<style lang="less" scoped>
.cart {
  width: 1200px;
  margin: 0 auto;

  h4 {
    margin: 9px 0;
    font-size: 14px;
    line-height: 21px;
  }

  .cart-main {
    .cart-th {
      background: #f5f5f5;
      border: 1px solid #ddd;
      padding: 10px;
      overflow: hidden;

      &>div {
        float: left;
      }

      .cart-th1 {
        width: 25%;

        input {
          vertical-align: middle;
        }

        span {
          vertical-align: middle;
        }
      }

      .cart-th2 {
        width: 25%;
      }

      .cart-th3,
      .cart-th4,
      .cart-th5,
      .cart-th6 {
        width: 12.5%;

      }
    }

    .cart-body {
      margin: 15px 0;
      border: 1px solid #ddd;

      .cart-list {
        padding: 10px;
        border-bottom: 1px solid #ddd;
        overflow: hidden;

        &>li {
          float: left;
        }

        .cart-list-con1 {
          width: 15%;
        }

        .cart-list-con2 {
          width: 35%;

          img {
            width: 82px;
            height: 82px;
            float: left;
          }

          .item-msg {
            float: left;
            width: 150px;
            margin: 0 10px;
            line-height: 18px;
          }
        }


        .item-txt {
          text-align: center;
        }
      }

      .cart-list-con4 {
        width: 10%;

      }

      .cart-list-con5 {
        width: 17%;

        .mins {
          border: 1px solid #ddd;
          border-right: 0;
          float: left;
          color: #666;
          width: 6px;
          text-align: center;
          padding: 8px;
        }

        input {
          border: 1px solid #ddd;
          width: 40px;
          height: 33px;
          float: left;
          text-align: center;
          font-size: 14px;
        }

        .plus {
          border: 1px solid #ddd;
          border-left: 0;
          float: left;
          color: #666;
          width: 6px;
          text-align: center;
          padding: 8px;
        }
      }

      .cart-list-con6 {
        width: 10%;

        .sum {
          font-size: 16px;
        }
      }

      .cart-list-con7 {
        width: 13%;

        a {
          color: #666;
        }
      }
    }
  }
}

.cart-tool {
  overflow: hidden;
  border: 1px solid #ddd;

  .select-all {
    padding: 10px;
    overflow: hidden;
    float: left;

    span {
      vertical-align: middle;
    }

    input {
      vertical-align: middle;
    }
  }

  .option {
    padding: 10px;
    overflow: hidden;
    float: left;

    a {
      float: left;
      padding: 0 10px;
      color: #666;
    }
  }

  .money-box {
    float: right;

    .chosed {
      line-height: 26px;
      float: left;
      padding: 0 10px;
    }

    .sumprice {
      width: 200px;
      line-height: 22px;
      float: left;
      padding: 0 10px;

      .summoney {
        color: #c81623;
        font-size: 16px;
      }
    }

    .sumbtn {
      float: right;

      a {
        display: block;
        position: relative;
        width: 96px;
        height: 52px;
        line-height: 52px;
        color: #fff;
        text-align: center;
        font-size: 18px;
        font-family: "Microsoft YaHei";
        background: #e1251b;
        overflow: hidden;
      }
    }
  }
}
</style>